Sifter or screen.



G. H. FRASER.

SIFTER OR SCREEN. APPLICATION FILE'D JUNEZQ. 1915.

Patented Dec. 28, 1915.

WITNESSES COLUMBIA PLANOGMPH Co..\v/\sHmGTON. D.

lUNlTED sracrns PATENT GEORGE HOLT FRASER, OF NEW YORK, N. Y.

SIFTER OB SCREEN.

1,165,8ilti.

Original application filed December 29, 1910, Serial No. 599,913.

Divided and. this application filed June 29, 1815.

To all whom it may concern:

Be it known that I, Gnoncn HOLT FRASER, a citizen of the United States, residing in the borough of Brooklyn, in the county of Kings, in the city and State of New York, United EJtates of America, have invented certain new and useful Improvements in Sifters or Screens, of which the following is a specification, being a division of my application, Serial No. 599,913, filed Decem ber 29, 1910.

This invention relates to devices for separating, sizing, bolting, classifying, treating or collecting, materials, and aims to provide certain improvements therein. 1

My invention provides improvements especially applicable to devices of this general character, and in its preferred form it utilizes a nonrotary feed tube and an initial distributer, in conjunction with a plurality of superposed annular distributers successively receiving the material, an annular screen, an

annular discharge passage, and means for separately withdrawing the different products, and various features of improvement in construction, arrangement and details, all of which will be hereinafter more fully set forth.

The accompanying drawing is a vertical axial section showing the preferred form of my invention.

Referring to the drawing, A'indicates a casing, B the driving mechanism, C the feed hopper, D the distributor, E a chamber, g the coarse outlet, and I the fine outlet. These may be of any usual or suitable construction and arrangement capable of distributing the feed, and collecting and discharging the products.

Referring to the drawing 1 will now describe in detailthe preferred form of my invention in the adaptation therein illustrated.

The casing A has a cylindrical body a, and tapering and conical top and bottom, made in sections, preferably halves, braced and flanged, and adapted to be bolted to the adjoining circumferential sections, and it has as many vertical sections as are desired to give the requisite height, two being shown. These sections are shown as straight and connected by bars 6 which tend to preserve the cylindrical form of the body and support the internal parts in position. The upper Patented 11 cc, 28, rare.

Renewed March 30, 1915, Serial No. 18,128.

Serial No. 37,033.

part of the casing consists of a head 0 which is tapered in the form of a truncated cone and has an annular top (Z, and a central cavity or depressed portion 6. The lower part of the casing consists of a conical bottom f, suspended from the top body a. The body a is suspended from the top d and the latter is suspended from the bearing frame g.

The driving mechanism shown consists of a driving shaft h carrying fast and loose pulleys i, and geared to the driven parts by bevel gears. This shaft is mounted in bearings in the frame 9, which frame is shown as crossing the machine, and supported by timbers at the side thereof, and the entire device as shown is suspended from the frame, which has one face coinciding with the diametric parting of the body.

The hopper C is preferably a stationary hopper, adapted to turn in any direction to connect with any source of feed, and preferably having a screw threaded discharge outlet. The feeder is preferably a non-rotary feed pipe J which is preferably vertically adjustable, as by screwing into the hopper outlet, and which leads into the casing and discharges onto a distributer K therein, the speed of feed being determined by vertical adjustment of the pipe, or of the distributer, or of both, as desired.

The distributer is preferably a rotary member, and preferably comprises the disk K and one or more successive distributors, as the rings L and M, which are carried by and revolve with the disk K in the construction shown. ()pposite the disk K there is located a battle ring is receiving the discharge therefrom and deflecting it downwardly toward the ring L, opposite which there is another similar baflie ring Z, receiving discharge from the ring L and directing it down onto the ring M, opposite which there is another baliie ring m deflecting the material downwardly toward the return cone 0. Collectors n and 0 converge the material on rings L and M.

The distributer is carried by and driven from a tubular head B, which is suitably spaced above it to permit the necessary passage for material between the disk 1i and the head, and which extends upwardly around the pipe J, and is adjustably suspended from the bearing D, and is driven through a gear E, which is preferably driven by a cone pulley F and belt G from, a reverse cone pulley H on the shaft it, By shifting the belt the relative speeds of the pulleys F and H can be regulated.

All bearings. consist of an annular cup 71 receiving an annular flange y" so that the earings run in oil. Each bearing is clamped in a half socket in the frame ,1 so that by removing the clamps the parts can be bodily removed sidewise, the parting faces of these clamps correspond with the diametric parting of the casing, so that by removing a detachable half the interior is accessible.

The gears, bearings and collars, are inclosed for dust protection, and the upper bearing D is formed on a frame on removably carried on the frame 9 so that, this frame may be removed and the bracket n, detachably carrying the feed tube and supportingthe hopper, may be lowered onto the bearing M of the frame. 7

F or classifying or grading the fines my invention preferably provides one or more classifying screens beneath the distributing chamber E, receiving the discharge from the return cone 0, and grading and sizing it so .the coarsest outlet 9.

:being normally as to separate out desired sizes before the remaining tailings or fines passing these screens are permitted to fall onto the tailings cone S. Two sizing screens, a coarse inner one Q, and a medium outer one B each conical and nested together, are shown as yieldingly suspended by springs S from the return cone 0, so as to receive the tailings therefrom. The coarsest material flows down the screen Q and falls through its outlet to Material passing through this screen flows down the screen R and escapes through the medium outlet 1*, and material passing through the screen R flows down the tailings cone S to the tailings outlet I. The outlets r, g and I are connected to-their respective cones by a series of conduits or pipes s passing each Within the next, either concentrically as shown, or nested eccentrically so as to give the greatest external passageway at the lower side if desired. In this manner three mechanical gradings are effected.

To agitate the mechanical screens my invention provides a swinging knocker T which preferably revolves with the distributer and strikes a projection t on the screen when the latter is depressed, these parts out of coincidence, but being brought into the same path by the depression of the screens either by reason of the weight of material on them if they become clogged, or by reason of the handle is when desired, To permit this depression the screens are yieldingly mounted by means of their cylindrical necks Z in the upper ends of their respective pipes 8. Thus they will automatically cause themselves to depress the springs and to be agitated when overloaded, and restore themselves When free from undue weight.

In operation the material entering the feed pipe will be controlled by its adjustment, the speed will be regulated to give the desired'results and the various products will be separately withdrawn according to classification. One or all of the methods of classification will be used according to particular requirements.

It will be understood that the invention is not limited to the particular details of construct-ion, arrangement and combination set forth, as it can be employed in Whole or in part according to any modifications.

vVhat Iclaim is: V

l. A circular screen,means for distributing material to be screened thereto, a revolving part, strikers carried by said part and below the upper edge of and within said screen, and internal provisions carried by said screen for receiving the impact of said strikers for vibrating said screen.

2. A circular screen, a distributor for feeding material thereto, an impact striker revolving around the axis of said screen for agitating said screen, and means carriedby. said screen for receiving the impact of said striker, said striker and means normally out of coincidence and the one movable relatively to the other to bring them into engagement.

3. A conical screen, means for feeding.

material thereto, and meansbetween said screen and said feeding means and Within and surrounded y said screen for jarring the latter. H

a. A plurality of conical screens, one within the other, means for feeding material to said screens, and means within and surrounded by'said screens for jarring them.

5. A circularly disposed screen, means for feeding material therein, and revolving meansbelowsaid feeding means and within said screen for impactively jarring it.

6. A circularly disposed screen resiliently mounted, means for feeding material to said screen, and means between said feeding means and said screen Within and surrounded by said screen for jarring the latter.

7. A circularly formed upright screen flexibly suspended, means for feeding material onto said screen, andmeans below the top of and within said screen for jarring feeding material to said screen, and means for jarring said screen comprising a swinging striker pivotally mounted Within and surrounded by said screen.

10. A circularly formed screen, surrounding a vertical axis and mounted to be descended by gravity, and jarring mechanism for jarring said screen When it descends revolving around said axis and normally inactive relatively to said screen.

11. A. circularly formed screen, means for feeding material to said screen, and means Within and surrounded by said screen for jarring it.

12. A screen, means for feeding material to said screen, and jarring mechanism for said screen comprising an impact member mounted thereon and a centrifugal striker Copies revolving around a vertical axis and percussively striking said member.

13. A rotary distributer, an annular feeding ring receiving material therefrom, a circularly formed screen onto which material is fed by said feeder, a fine outlet below said screen, a coarse outlet conduit for the tailings from said screen, and means below and N of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, .D. G. 

